Regardless of which type of control you have, 75F has a solution. The next question would be whether the AHU has any sort of economizer. If it has an economizer an OAO will be necessary.

Variable Air Volume (VAV) box

Multi-story office buildings often use a single AHU to serve multiple zones with varying loads. To counteract this VAV boxes are introduced to help redirect air to where it is needed or reduce the airflow for a reheat call.

For an office building where there are water source reheats a modulating analog valve can be used to modulate the flow of hot water through the reheats. In this application it is typical for the boilers to internally control the loop temperature at ~140F. When this is the case, in a 75F implementation all we would add is a temperature monitoring device to monitor and alert on loop temperature.